currentscript/Gruntfile.js

Polyfill of HTML5's `document.currentScript`

/*jshint node:true, maxstatements:false, maxlen:false */

var versionSync = require("local-version").sync;
var semver = require("semver");

module.exports = function(grunt) {
  "use strict";

  // These plugins provide necessary tasks.
  grunt.loadNpmTasks("grunt-contrib-jshint");
  grunt.loadNpmTasks("grunt-contrib-concat");
  grunt.loadNpmTasks("grunt-contrib-uglify");
  grunt.loadNpmTasks("grunt-karma");

  // Project configuration.
  grunt.initConfig({

    // Metadata.
    pkg: grunt.file.readJSON("package.json"),
    banner: "/*!\n" +
      " * <%= pkg.title || pkg.name %>\n" +
      " * <%= pkg.description %>\n" +
      " * Copyright (c) <%= grunt.template.today('yyyy') %> <%= pkg.author.name %>\n" +
      " * Licensed <%= _.pluck(pkg.licenses, 'type').join(', ') %>\n" +
      "<%= pkg.homepage ? ' * ' + pkg.homepage + '\\n' : '' %>" +
      " * v<%= pkg.version %>\n" +
      " */\n",

    // Task configuration.
    jshint: {
      options: {
        jshintrc: true
      },
      gruntfile: ["Gruntfile.js"],
      karma: ["karma.conf*.js"],
      js: ["src/**/*.js", "!src/start.js", "!src/end.js"],
      test: ["test/**/*.js"],
      dist: ["dist/*.js", "!dist/*.min.js"]
    },
    concat: {
      options: {
        banner: "<%= banner %>",
        stripBanners: true
      },
      dist: {
        src: ["src/start.js", "src/main.js", "src/end.js"],
        dest: "dist/<%= pkg.title %>.js"
      }
    },
    uglify: {
      options: {
        report: "min",
        preserveComments: "some"
      },
      dist: {
        src: ["<%= concat.dist.dest %>"],
        dest: "dist/<%= pkg.title %>.min.js"
      }
    },
    karma: (function() {
      var taskConfig = {
        local: {
          configFile: "karma.conf.js",
          autoWatch: false,
          singleRun: true
        },
        ci: {
          configFile: "karma.conf-ci.js"
        }
      };

      // Support for `conf.concurrency` was added in `karma@0.13.12`
      var karmaVersion = versionSync("karma");
      if (semver.gte(karmaVersion, "0.13.12")) {
        // Just use the built-in mechanism in Karma >= 0.13.12
        grunt.registerTask("karma-ci-chain", ["karma:ci"]);
      }
      else {
        var maxConcurrency = 1;
        var karmaConfCi = require("./" + taskConfig.ci.configFile);
        var karmaCiTaskChain = [];
        karmaConfCi(
          {
            set: function(conf) {
              if (typeof conf.concurrency === "number") {
                maxConcurrency = conf.concurrency;
              }

              if (conf.browsers && conf.browsers.length > 0) {
                var i, len, target, targetName,
                    ie6Regex = /_ie_6\.0$/;

                // Workaround for IE6 issue requires it to use the "jsonp-polling" transport:
                //   https://github.com/karma-runner/karma/issues/983
                var ie6Browsers = conf.browsers.filter(function(browserId) {
                  return ie6Regex.test(browserId);
                });
                for (i = 0, len = ie6Browsers.length; i < len; i += maxConcurrency) {
                  target = {
                    configFile: taskConfig.ci.configFile
                  };
                  target.browsers = ie6Browsers.slice(i, i + maxConcurrency);
                  target.transports = ["jsonp-polling"];
                  targetName = maxConcurrency === 1 || len === 1 ? target.browsers[0] : "ci_ie6_" + ((i / maxConcurrency) + 1);
                  taskConfig[targetName] = target;
                  karmaCiTaskChain.push("karma:" + targetName);
                }


                var otherBrowsers = conf.browsers.filter(function(browserId) {
                  return !ie6Regex.test(browserId);
                });
                for (i = 0, len = otherBrowsers.length; i < len; i += maxConcurrency) {
                  target = {
                    configFile: taskConfig.ci.configFile
                  };
                  target.browsers = otherBrowsers.slice(i, i + maxConcurrency);
                  targetName = maxConcurrency === 1 || len === 1 ? target.browsers[0] : "ci_" + ((i / maxConcurrency) + 1);
                  taskConfig[targetName] = target;
                  karmaCiTaskChain.push("karma:" + targetName);
                }
              }
            }
          },
          true
        );

        // `grunt-karma` does not correctly honor buffering launcher
        // requests to the limit of maxConcurrency of a SauceLabs
        // account, which usually results in lots of errors
        grunt.registerTask("karma-ci-chain", karmaCiTaskChain);
      }

      return taskConfig;
    })()
  });

  // Helper tasks
  grunt.registerTask("jshint-prebuild",  ["jshint:gruntfile", "jshint:karma", "jshint:js", "jshint:test"]);
  grunt.registerTask("jshint-postbuild", ["jshint:dist"]);

  // Default task.
  grunt.registerTask("default", ["jshint-prebuild", "concat", "uglify", "jshint-postbuild", "karma:local"]);
  // TravisCI task.
  grunt.registerTask("travis",  ["jshint-prebuild", "concat", "jshint-postbuild", "karma-ci-chain"]);

};